4586 Fix Activities Dashboard alert not going away when new activities are added

[tbolt]

Resolves #4586

Description

Fixes an issue on the activities dashboard page where if you add an a new activity, the alert banner does not disappear.

Steps to manually verify this change

1. Login to an MMIS APD that doesn't have any existing activities (or delete all current ones)
2. Verify that the alert about no activities is displayed
3. Add an activity and verify the alert goes away

This pull request is ready to code review when

• [ ] Automated tests are updated (and all tests are passing)
• [ ] New automated test cases are documented above
• [ ] Chromatic link added above
• [ ] Pull request has been labeled, if applicable with feature, content, bug, tests, refactor
• [ ] Associated OpenAPI documentation has been updated
• [ ] The experience passes a basic manual accessibility audit (keyboard nav, screenreader, text scaling) OR an exemption is documented

This pull request is ready to test when

• [ ] Code has been reviewed by someone other than the original author

This pull request is ready to review when QA has

• [ ] Verified the functionality related to the change
• [ ] Verified that the change works with Narrator on Windows
• [ ] Verified that the change works with VoiceOver on Mac
• [ ] Verified all updated pages with the WAVE tool
• [ ] Verified tab and keyboard navigation functionality

This pull request can be merged when

• [ ] Design has approved the experience
• [ ] Product has approved the experience

[codecov[bot]]

Codecov Report

Merging #4671 (dd5fed0) into main (96dd719) will decrease coverage by 6.14%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4671      +/-   ##
==========================================
- Coverage   94.43%   88.29%   -6.14%     
==========================================
  Files         282      279       -3     
  Lines        8992     8786     -206     
  Branches     1823     1823              
==========================================
- Hits         8492     7758     -734     
- Misses        476      991     +515     
- Partials       24       37      +13     

Flag	Coverage Δ
api	∅ <ø> (∅)
common	99.16% <ø> (ø)
web	87.67% <ø> (-6.50%)	:arrow_down:

Impacted Files	Coverage Δ
...vities/activities-dashboard/ActivitiesDashboard.js	100.00% <ø> (ø)

... and 24 files with indirect coverage changes

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[cms-eapd-bot]

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